staging: dgap: remove unnecessary space after cast

This patch removes unnecessary spaces after the cast.
Patch done with coccinelle semantic patch:

@rule0@
type t;
identifier e;
constant c;
expression expr;
@@

(
- (t) e
+ (t)e
|
- (t) c
+ (t)c
|
- (t) expr
+ (t)expr
)

Signed-off-by: Ioana Ciornei <ciorneiioana@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>